X-Git-Url: https://git.lizzy.rs/?a=blobdiff_plain;f=src%2Fdoc%2Frustc%2Fsrc%2Finstrument-coverage.md;h=da91e25595cc760f117b1eb265748e96ce0c4c6b;hb=6b49435480ea9a6d8bbd7fd2acf7b3aa6607577c;hp=38fd5c96997631d1ce77b3348e88b7754a8ca63b;hpb=7743aa836ee16d04831a34ee1ff109bf9d411277;p=rust.git

diff --git a/src/doc/rustc/src/instrument-coverage.md b/src/doc/rustc/src/instrument-coverage.md
index 38fd5c96997..da91e25595c 100644
--- a/src/doc/rustc/src/instrument-coverage.md
+++ b/src/doc/rustc/src/instrument-coverage.md
@@ -201,6 +201,8 @@ $ RUSTFLAGS="-C instrument-coverage" \
     cargo test --tests
 ```
 
+> **Note**: The default for `LLVM_PROFILE_FILE` is `default_%m_%p.profraw`. Versions prior to 1.65 had a default of `default.profraw`, so if using those earlier versions, it is recommended to explicitly set `LLVM_PROFILE_FILE="default_%m_%p.profraw"` to avoid having multiple tests overwrite the `.profraw` files.
+
 Make note of the test binary file paths, displayed after the word "`Running`" in the test output:
 
 ```text